Penetrometer



F. RODLER PENETROME TER Dec. 15, 1925. Y 1.565.502

Filed 00i- 23. 1924 2 Sheets-snee: 1

Mael 52 Y 52 Patented Dec. 15, 192.5.

UNITED ST ATEis r o'FfFrcE.

FRED Robien, oF c'iitciiInArr, offro.

. TROMETER.

by'means of aig'augeto -readvthe amount of penetration of theV'needle'.V 4

lIn machines' of this character the accuracy of work'is deterinirrd by`the nicety of the iirst adjustmentof` the needle with relation to thegauge', and theaccuracy of the gauge itself.

My invention has its; objectv the cnstruction inexpensively of asuitablegauge, in which the'y mainarbo'r'fis given adequate support,thereby fpermitting` a, gear .and pinion drive for'the" gauge .needleytobe'us'e'd as a perfectly-reliable mode oit operation. It is my objectftosimplify .the vstructure of means. for return spring, andjmeans "fordriving the main arbor .by" me'a1is`fof alien ible strip of kmetallengaging over 'a the motion of which is opposedby the said It is alsofmyy object tof provide yinici-Oilfieter adjustment of the'l needle,gauge at Zero, and piece oi n'iateriall tobe tested,`to the end ofstartingthe ,work at anaccuatelpoi't.

l' faiecomplish my 'objects' by that certain construction' andarrangement of parts tov be Y hereinafter more specifically pointed outand claimed.,

InE the' drawings:

Figure l is a' perspective view of the device. v

Figure Qwlis a kfrontelevation of the gauge with the coverplalt'esreinoved' I.

Figure 3 is a detail ycress section of 'the -micrometer table.

Figure lis a central vertical cross section of thegauge. y

is a detail plan view of theV VFigure 5 spring housing. l

Figurel 6'is a section' on line 6-'6 ofFigure 3. l

Referring to the structure shown in' the drawingswhich is given as "atypical eX- ample of my invention, I provide a table- 'likebase '1,having Van aperture 2, for the table operatingele'ments. The workvsupportrng`table 3 has a central'post 4, anda pair of inclined dependingwebs 5, 5. The

bas'ehas a pair of depending webs 6, 6, andl a wedge is'pro'vided whichis set beneath the webs and rests on supporting yplates 7, 7, secured onthe bottom edges of the base webs'e. The ,wedge is formed as a fork,with the tines 8, 81, vof wedge-like shape and a cross k'inen'iber 9,into which is threaded the adjusting screw l0.y The adjustingscrew has asmooth portion 11, which seats ina -ifotchlQin the edge of thetabl-e sothat-the screw cannot move endwise with relation to the table.A Theturning O''thehea'd of the screw will thus force the Wedge tines 'in orout'with relation toith'e base, and raisethe table or vpermit ittolower.

'In ordento guide lthe table, the base -is formed with Va prejection`l12 terminating in a boss `13, therebeing space left for the table webs5 vat both sides of the projection.

VThe'.central post 4l is secured to the table passes down ythrough the'boss. A spring `15 mounted on the end lof Vthepost bearsV against the`boss 'and' tends to force VVthe table'. downwardly, so that it `followsthe adwedg'e y It is tevident that this construction pei"- mits ffi'leadjustments ofthe table, which 'will give amicrometer adjustment. Itismy intention 'that the rough adjustmentsl for work to'- be done, bevaccomplished" by moving 'tlregaugefbodilv andthe fine adjustments bemade'by moving the table, onlv which the material to be tested isarranged.

The standard 16 is mounted lon th'elbase and carries a slider v1,7,which i's held in p lacefon the standard, adjustably, by means of asetscrew 18.' The slider hasa mounti'ng f plfate'thereon, as atl9, .for thegauge, and'it has 1 also secured 'tjlie'reto, p the 'needle plungerjournal QO'. I `have not shownv the details of this journahbut vit'wi'llbeunder s'toodthatfollowing general practice, atinger piece QLwhendepressed will releasethe plunger for rmovement through rthe v'journalbut Whenreleas'edv w'illA a brake to' the plunger so that 'itcannotm'ovef V 'lheplurfgerx is shownatQQ, and' has a chuck 28`forthepenetrationneedle 24. At theupper end'the plungeris to be equippedwithweightaas at 25.

VIn" yoperation the plunger is moved .up

indicator arbor 45.

until it contacts at its upper end with the gauge contact piece. Theslider is then moved along the standard, until the needle is close tothe top tace of a piece of material to be tested, that is resting on thetable. The slider is then clamped and the table adjusted to bring thepoint of the needle into contact with the piece to be tested. The gaugebeing at zero position, the operator grasps the linger piece 2l andholds it in plunger releasing position for the required time. He thenoperates the gauge to give a reading of penetration ot the needle.

l will now describe the preferred torni of gauge. The casing ot thegauge is indicated as having a cyliudricai side wall 3l), and a backwall 'l. he main arbor i122 is jorunaled in the back wall, and a pointedforward end not shown which engages a depression for a point bearing inthe cover plate 34. This plate 34 is mounted on posts 35 over the gaugemechanism in the usual manner for mechanisms or' this character.

The arbor has a drum 36 on which is secured a metal ribbon 37, by meansof which the arbor is operated. rlhe arbor projects through the backwall of the c asing, and beyond this wall has a coiled spring 38thereon, which is held at its outer end by a slotted screw 39, set intothe back wall. l

The arbor projects beyond this spring, and a small housing is providedhaving an attaching lug 40 to be screwed to the back wall of the casing,and a hollow body 4l to surround the spring. In the body is a hole 42 toserve as a third journal for the main arbor.

It is thus evident that a three-point bearing is provided for the mainarbor, in a very simple manner, and that abuse or" the instrument cannotnormally get the arbor out of line or distorted, and accordingly thatthe arbor will always run smoothly and accurately.

'lhe arbor has a gear 43 thereon, which meshes with a smaller pinion 44,on the This arbor is mounted in the back wall and passes through thecover plate, and a small bracket 46 (only indicated) will hold thepinion and hence the indicator arbor, in position of mesh f'ith the gear43.

The dial plate 47 is mounted over th'e cover plate by any desired means,and the indicator arrow 48 on the arbor 45 moves around the dial, whichis calibrated to read in distances of penetration.

The contact piece 49 of the gauge is secured to a U-shaped rod, havingthe arms 50 and 5l. The arm 5l passes up through the gauge and out atthe top, and is equipped with a head 52. rlhis arm has also theadjustable block 53 thereon, which holds the end of the metal ribbonthat `is not secured to the drum on the main arbor.

The rod portion 50 extends only part way into the gauge casing, andserves as a guide.

On top of the contact piece of the gauge is a screw 53, over which isset a screw cap 54. rlhis cap has an enlarged knurled head` 55, whichabuts against the bottom of the gauge casing, and the body of the cappasses in and out ot a hole in the bottom of the said casing. Thus byadjusting the cap, the uppermost positiono the contact piece will bedefined, and in operation this cap is adjusted to bring the indicatorarrow to Zero. The spring on the main arbor pulls up on the rods 5() andthus holds the cap normally in its uppermost position or abutmentagainst the lower face of the gauge casing.

Proceeding with the operation of the device, following a setting of theneedle into contact with the material to be tested, which I have alreadydescribed, the operator permits the needle to penetrate the materialvfor a given time. He then depresses the head 52 of the contact piecerod 51, which revolves the drum on the main arbor by means of the ribbonwhich is wound around it and secured to the rod. lt also depresses thecontact piece until it strikes the upper end of the plunger. The mainarbor drives the indicator arrow around to give a reading of how far thecontact piece was lowered, which will give a measure in tine degrees ofdistance which the needle penetrated during the given period of time.

Having thus described my invention by a typical example thereof, what Iclaim as novel therein and desire to secure by Letters Patent, is

l. ln a penetrometer, the combination with a base and standard, of anadjustable element on the standard, said element having a gauge andneedle plungerthereon, a material supporting table on the base, andmeans for giving micrometer adjustment in height to the table to provide[ine adjustments of the position of the surface of a piece of materialto be tested.

2. In a penetrometer, the combination with a base and standard, of anadjustable element on the standard, said element having a gauge and aneedle plunger thereon, a material supporting table on the base, and ascrew adjusted wedge for regulating the height of the table withrelation tothe base to provide ne adjustments of the position of thesurface of a piece of material to be tested.

In a penetrometer, the e combination with a needle plunger and gauge anda material support, of framework for supporting said plunger gauge andsupport, means for adjusting the position of I the gauge and plungerwith relation to the framework, and means for adjusting the position ofthe material support with relation to the framework.

il. An adjustable material. supporting table for penetrometerscomprising, in combination with a base, a table having inclineddepending webs thereon,` vertically sliding means intermediate the tableand the base, said webs passing through the base, an adjustable wedgearranged to support the table webs, and4 means' on the base forsupporting the wedge.

An adjustable ymaterial supporting table for penetrometers comprising,in combination with a base, a table having inclined depending webspassing through the base, webs depending in the base along which thetable webs lie, a wedge having elements located in support of theinclined webs, supporting plates for the wedge elements secured to thebase webs, and a screw rotatably mounted in the base, and threaded in'-to the wedge, and means for guiding the table for vertical sliding only,with relation to the base.

6. An adjustabler material supporting table for penetrometerscomprising, in com.k bination with a base, a table having inclineddepending webs passing through the base, webs depending in the basealong which the table webs lie, a wedge having elements lof VVing fromthe table, a boss on the base, and

a spring engaging the lower end of the post and of the boss, as and forthe purpose described.

FRED RODLER.

